HTML Attributes List

List  of HTML Attributes specifying the tag(s) for which each attribute is used:

Attribute	Description	Used with Tag(s)
accept	Used with <input> element only.	<input>
accept-charset	Define character encoding for form submission.	<form>
accesskey	Keyboard shortcut to activate/focus elements.	Various
action	Specify where form data is sent after submission.	<form>
align	Specify alignment of text content.	Deprecated
alt	Show/display something if primary attribute isn't displayed.	<img>, <area>
async	Works only for external scripts (when src is present).	<script>
autocomplete	Specify whether input field should autocomplete.	<input>
autoplay	Audio/video should automatically start playing on page load.	<audio>, <video>
autofocus	Element should be focused on page load.	Various
bgcolor	Set background color of an HTML element.	Deprecated
border	Set visible border width for elements within body.	Various
charset	Define character encoding.	<meta>
checked	Indicate if element should be checked on page load.	<input>
cite	Specify URL of document explaining quotes/message.	<blockquote>, <q>
class	Specify one or more class names for an element.	Various
cols	Number of columns a cell should span.	<td>, <th>
colspan	Number of columns a cell should span.	<td>, <th>
content	Values related to http-equiv or name attribute.	<meta>
contenteditable	Specify if content in element is editable.	Various
controls	Boolean attribute, new in HTML5.	<audio>, <video>
coords	Specify coordinates of an area in an image map.	<area>
data	Specify URL of embedded file of Object.	<object>, <link>
data-*	HTML5 attribute for custom data.	Various
datetime	Specify date and time of inserted and deleted text.	<del>, <ins>
default	Specify track enabled if user preferences don't suggest otherwise.	<track>
defer	Execute when page has finished parsing.	<script>
dir	Text direction of element content.	Various
dirname	Enable text direction of input/textarea after form submission.	<input>, <textarea>
disabled	Indicate if element is disabled.	Various
download	Download element when user clicks hyperlink.	<a>, <area>
draggable	Specify if element is draggable.	Various
dropzone	Specify how dragged data behaves when dropped.	Various
enctype	Data present in form, encoded when submitted to server.	<form>
for	Used in both <label> and <output> elements.	<label>, <output>
form	Element can contain one or more forms.	Various
formaction	Specify where form data is sent. Called after form submission.	<button>, <input>
headers	Specify header cells a table cell is related to.	<th>, <td>
height	Specify height of element.	<img>, <canvas>, <iframe>
hidden	Define visibility of elements.	Various
high	Range where gauge value is considered high.	<meter>
href	Specify URL of document.	<a>, <link>
hreflang	Language for linked document.	<a>, <link>
http-equiv	Provide header info or value of content attribute.	<meta>
id	Used by CSS and JavaScript for specific tasks.	Various
ismap	Boolean attribute for image maps.	<img>
kind	Kind of track (used in <track>).	<track>
label	Title of Text Track, used by browser when listing available tracks.	<track>
lang	Specify language of element content.	Various
list	Pre-defined options for <input> to suggest user.	<input>
loop	Restart audio/video after finishing.	<audio>, <video>
low	Range where gauge value is considered low.	<meter>
max	Specify maximum value of an element.	<input>, <meter>, <progress>
maxlength	Maximum number of characters in <input> element.	<input>, <textarea>
media	Specify media/device for linked document.	<a>, <link>, <source>, <style>
method	HTTP method used to send data when submitting form.	<form>
min	Specify lower bound of gauge.	<input>, <meter>, <progress>
multiple	Allow selecting more than one value in an element.	<input>
muted	Audio output of video is muted.	<video>
name	Specify name for element.	Various
novalidate	Form data shouldn't be validated when submitting form.	<form>
onblur	Event when element loses focus.	Various
oncopy	User copied content in an element.	Various
oncut	User cut or deleted content in element.	Various
onkeypress	Event when user presses a key on keyboard.	Various
onmousedown	Order of events related to onmousedown event.	Various
onscroll	Event works when an element's scrollbar is scrolled.	Various
optimum	Optimal numeric value for gauge.	<meter>
pattern	Short hint for expected value of input field/textarea.	<input>
placeholder	Short hint for expected value of input field/textarea.	<input>, <textarea>
readonly	Text in <input> or <textarea> is read-only.	<input>, <textarea>
required	Input element must be filled before submitting form.	Various
reversed	Order list in descending order instead of ascending.	<ol>
rows	Number of visible text lines for control (rows to display).	<textarea>
rowspan	Number of rows a cell should span.	<td>, <th>
selected	Specify which option is selected by default.	<option>
size	Initial width for input and number of visible rows for select.	<input>, <select>
spellcheck	Applied to HTML forms using spellcheck attribute.	Various
srclang	Specify language of track text.	<track>
start	Start value for numbering individual list items.	<ol>
step	Set discrete step size of <input> element.	<input>
style	Three ways of implementing style in HTML.	Various
tabindex	Navigation using Tab button.	Various
target	Specify where linked document should open.	<a>, <form>, <base>, <area>
title	Specify extra information about element.	Various
translate	Specify if content of element is translated.	<body>
value	Specify value of element it's used with.	Various
wrap	Specify text wrapping in <textarea> when form submitted.	<textarea>

Please note that the "Used with Tag(s)" column provides general information about the tags with which an attribute is commonly used. The list might not be exhaustive, as attributes can sometimes be used with other tags as well.